516442 2026-02-21 07:31:52 +0000 Wacom tablet always shows 3 buttons even if fewer are supported 2026-02-27 23:33:37 +0000 1 1 2 Applications systemsettings kcm_tablet 6.6.0 Other Linux RESOLVED FIXED regression NOR normal --- 1 realkpavel plasma-bugs-null aleixpol josh nate https://invent.kde.org/plasma/plasma-desktop/-/commit/fbed2cb25a460e4d6dd2c85b69330b60e5cac76a 6.6.1 0 oldest_to_newest 2496958 0 189907 realkpavel 2026-02-21 07:31:52 +0000 Created attachment 189907 libwacom-list-local-devices output SUMMARY I have a Thinkbook 14s Yoga. All the pens supported for this model in libwacom only have one button (see attachment). PLasma used to correctly show one button in the KCM until 6.5.4, but now it always shows 3 buttons. I have taken a look at the logs and code listings and I think this is a regression introduced by https://invent.kde.org/plasma/plasma-desktop/-/commit/b1c4cf7b11a9f320709246a47056542ac8093a46. If I understand the code correctly, the newly introduced logic now effectively does numButtons = max( (numButtons on any stylus), 3). Included is a patched kcmtablet.cpp, where the logic is changed to: numButtons = tabletSupported? max(numButtons on any stulys), 3 which is what I think was intended here. I can try getting a second drive and buiding this to test it . STEPS TO REPRODUCE 1. Open the Drawing Tablet KCM on a Lenovo Yoga device Operating System: Fedora Linux 43 KDE Plasma Version: 6.6.0 KDE Frameworks Version: 6.23.0 Qt Version: 6.10.1 Kernel Version: 6.18.12-200.fc43.x86_64 (64-bit) Graphics Platform: Wayland Processors: 8 × 11th Gen Intel® Core™ i7-1165G7 @ 2.80GHz Memory: 16 GiB of RAM (15.4 GiB usable) Graphics Processor: Intel® Iris® Xe Graphics Manufacturer: LENOVO Product Name: 20WE System Version: ThinkBook 14s Yoga ITL 2496959 1 189908 realkpavel 2026-02-21 07:32:23 +0000 Created attachment 189908 patch for the bug (not yet tested) 2497376 2 bug-janitor 2026-02-22 20:34:08 +0000 A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-desktop/-/merge_requests/3567 2497777 3 josh 2026-02-23 21:21:16 +0000 Git commit fbed2cb25a460e4d6dd2c85b69330b60e5cac76a by Joshua Goins, on behalf of Kat Pavlu. Committed on 23/02/2026 at 21:21. Pushed by redstrate into branch 'master'. kcms/tablet: Stop showing non existent buttons Prevents the Tablet kcm from always showing 3 buttons on a pen if all supported pens have fewer than that. M +1 -0 kcms/tablet/kcmtablet.cpp https://invent.kde.org/plasma/plasma-desktop/-/commit/fbed2cb25a460e4d6dd2c85b69330b60e5cac76a 189907 2026-02-21 07:31:52 +0000 2026-02-21 07:31:52 +0000 libwacom-list-local-devices output penlist.txt text/plain 5474 realkpavel ZGV2aWNlczoKICAtIG5hbWU6ICdJU0R2NCA1MjZhJwogICAgYnVzOiAnaTJjJwogICAgdmlkOiAw eDA1NmEKICAgIHBpZDogMHg1MjZhCiAgICBub2RlczoKICAgICAgLSAvZGV2L2lucHV0L2V2ZW50 NTogJ1dhY29tIEhJRCA1MjZBIFBlbicKICAgIHN0eWxpOgogICAgICAtIGlkOiAweDEKICAgICAg ICB2aWQ6IDB4MDU2YQogICAgICAgIG5hbWU6ICdBRVMgUGVuJwogICAgICAgIHR5cGU6ICdtb2Jp bGUnCiAgICAgICAgYXhlczogWyd4JywgJ3knICwgJ3ByZXNzdXJlJ10KICAgICAgICBidXR0b25z OiAxCiAgICAgICAgaXNfZXJhc2VyOiAndHJ1ZScKICAgICAgICBlcmFzZXJfdHlwZTogJ2J1dHRv bicKICAgICAgLSBpZDogMHgxMQogICAgICAgIHZpZDogMHgwNTZhCiAgICAgICAgbmFtZTogJ0FF UyBQZW4nCiAgICAgICAgdHlwZTogJ21vYmlsZScKICAgICAgICBheGVzOiBbJ3gnLCAneScgLCAn cHJlc3N1cmUnXQogICAgICAgIGJ1dHRvbnM6IDEKICAgICAgICBpc19lcmFzZXI6ICd0cnVlJwog 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